Industrial Electronics N3 — Document
April 2021 — N3 — Industrial Electronics
N3
2021
Nated Engineering
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1.1Various options are given as possible answers to the following questions. Choose the correct answer and write only the letter (A D\ next to the question number (1.1.1
1.1.5\n the ANSWER BOOK.
1.1.1The energy gaps are an indication of the ype of material used Which of the following diagrams represent a semiconductor?
1.1.2ifferent bonds exist between atoms. Which of the following is a description of a metallic bond?
1.1.3When a PN junction diode is connected to a po wer supply, it function depends on its polarity. Which of the following describes forward biasing?
1.1.4Forward surge current can be define he maximum current the diode can handle when forward
1.1.5input wave form. egative series a nd positive shunt
1.2Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (1.2.1
1.2.5\in the ANSWER BOOK.
1.2.1The cut ff region in a transistor is when the base emitter is forward biased, and the base collector is reverse biased.
1.2.2The common base amplifier has a low voltage gain.
1.2.3Accuracy is the closeness to which measuring instrument reading approaches the true value.
1.2.4In a positive temperature coefficient thermistor, the resistance decrease when the temperature increases.
1.2.5
1.3Choose a term from COLUMN B that matches a description in COLUMN A. Write only the lette r (A G\next to the question number (1.3.1
1.3.5\ in the ANSWER BOOK. COLUMN A COLUMN B
1.3.5Control that is achieved by controlling the time at which the gate of the SCR is triggered The setting of a measuri ng instrument to measure a quantity as accurately as possible The base
1.4Choose ONE term for e ach of the following descriptions from the list below and write it next to the question number 1.
4.11.
4.5\n the ANSWER BOOK. conductors; metallic bond; positive feedback; optocoupler; mechanical characteristics; semiconductors; negativ e feedback; ionic bond; electrical characteristics; opto
1.4.1Elements with fewer than four electrons in their valence shell.
1.4.2A positive ion joins a negative ion.
1.4.3Maximum and minimum ratings are specified 1.
4.4Device consisting of a LED and a photodiode/phototransistor.
1.4.520
Q2— Section header —
2.1questions. FIGURE 1
2.1.1Determine the equation for Loop 1 (ABEFA\ (2\
2.1.2Determine the equ ation for Loop 2 (ABCDEFA\ (2\
2.1.3Determine the values of and by us ing the equations in
Q2— Section header —
2.2FIGURE 2 shows a resistor circuit. Use to answer the questions. IGURE 2
2.2.1Determine the equation for
2.2.2
2.3FIGURE 3 shows a series RCL circuit. Answer the questions. FIGURE 3
2.3.1Calc ulate the inductive reactance (1\
2.3.2Calculate the capacitive reactance (1\
2.3.3Calculate the total impedance (2\
2.3.4Calculate the total current of the circuit (2\
2.3.5Calculate the voltage across the capacitor (2\
2.3.6Calculate the voltage across the inductor (2\
2.3.7Calculate the phase angle (1\
2.3.8Calculate the resonant frequency (2\ [25] (8080613\ Copyright reserved25
Q3— Section header —
3.1Transistor are not only used in amplifier switch circuits. They may als o be used as regulators
3.2The load line of a common emitter amplifier represents all the possible combinations of collector currents and collector emit ter voltage for amplification. The position of the bias point determines the amplification class.
3.2.1Class B
3.2.2
3.3Answer the following questions regarding photo transistors.
3.3.1Draw a neat labelled characteristic curve of photo transistor. (3\
3.3.2FIGURE 4 shows a circuit diagram of the application of photo transis tor. escribe the operation of the circuit.
3.4Draw a neat labelled circuit diagram of an operational amplifier that is used as
3.5If the input wave of an integrating operational amplifie r is a square wave, dra the output wave form. (2\ [18] Q1 Q2 (8080613\18
Q4— Section header —
4.1Draw a neat labelled circuit diagram of a full wave doubler. (4\
4.2The reverse voltage in a varactor diode determine the thickness of the depletion layer and also the junction capacitance.
4.2.1Draw the characteristic curve of varactor diode. (3\
4.2.2Draw a neat circuit symbol for varactor diode (1\
4.2.3Name one use of varactor diode. (1\
4.3Photo conductors are one of the most co mmon transducers used in electronics. Describe the operation of photo conductor (2\
4.4The Wheatstone bridge is used as a basis for most transducer circuits. Describe the working principle of Wheatstone bridge. (2\
4.5Microphones us e the piezo electrical effect of crystal transducer to produce electrical current. Draw a neat
Q5— Section header —
5.1Draw a neat labelled block diagram of a continuous balance di gital volt meter. (5\
5.2Draw a neat labelled block diagram of a frequency counter. (5\
5.3Silicon controlled rectifiers are part of the thyristor family and are essentially power diode Draw the characteristic curve for a silicon
5.4To understand the working of silicon controlled rectifier it is best to consider it as two transistors.
5.5Silicon cont rolled rectifiers are not easy to switch off. Name ONE method to switch off silicon
Mark Allocation
Total100 marks
Sections20 + 25 + 18 + 17 + 20 = 100 marks
Paper information
TitleDocument
SubjectIndustrial Electronics
LevelN3
Document typeQuestion paper
Year2021
MonthApril
Pages10
Downloads3
Examination context
Decade2020s
Years ago5y
SeasonAutumn (SH)
Start dayThursday
Exam periodApril 2021
Days since exam2,020
About Industrial Electronics examination preparation
Industrial Electronics covers semiconductor devices, amplifiers, power supplies, and digital logic circuits. The examination tests both theoretical knowledge and practical circuit analysis.
How to use this resource for revision
A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?
For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.
semiconductor theory
circuit analysis
component identification
digital logic principles
interpreting circuit diagrams
A practical revision approach
Practice circuit analysis with correct formulae and units. The memorandum rewards accurate calculations, correct component identification, and proper interpretation of circuit diagrams.
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